Banks will change or go under but they won't go away. They will always find some service to provide that someone else will want to buy.
Crypto currency, including bitcoin, can not completely displace and destroy banks. Commercial and state banks are now adjusting and are also starting to buy and sell the Crypto currency. I know that at the same time take a commission of four percent or more. It should also be taken into account that some part of the population will never ever use crypts
Yeah and that includes older generation who will find complicated to use bitcoins as its very new concept for them and they will continue to use fiat even if bitcoin becomes more popular as they find easy and comfortable using fiat as they are using it since its inception.